X-ray active galactic nuclei in the core of the Perseus cluster [PDF]
Monthly Notices of the Royal Astronomical Society, 2007 We present a study of the X-ray emission from the nuclei of galaxies observed in the core of the Perseus cluster in a deep exposure with Chandra. Point sources are found coincident with the nuclei of 13 early-type galaxies, as well as the central galaxy NGC1275. This corresponds to all galaxies brighter than M_B = -18 in the Chandra field. All of these
S. Santra, J. S. Sanders, A. C. Fabian
semanticscholar +7 more sources
Local supermassive black holes, relics of active galactic nuclei and the X-ray background [PDF]
, 2004 We quantify the importance of mass accretion during AGN phases in the growth of supermassive black holes (BH) by comparing the mass function of black holes in the local universe with that expected from AGN relics, which are black holes grown entirely ...
A. Marconi +5 more
openalex +3 more sources
Radiation pressure acceleration by X-rays in active galactic nuclei [PDF]
Monthly Notices of the Royal Astronomical Society, 2001 We present calculations of the dynamics of highly ionized gas clouds that are confined by external pressure, and are ionized by AGN continuum. We focus on the gas that is seen in absorption in the X-ray spectrum of many AGN and show that such gas can reach hydrostatic equilibrium under various conditions. The principal conclusion is that the clouds can
Doron Chelouche, H. Netzer
openalex +5 more sources
Soft X-ray active galactic nuclei
The Astrophysical Journal, 1984 The discovery of 10 active galactic nuclei (AGNs) based upon optical observations of Einstein Observatory X-ray sources is reported. The new objects are optically similar to AGNs that have been identified by others with this technique. One notable exception, the quasar E1821 + 643, is associated with a previously unidentified X-ray source detected with
F. E. Marshall, S. H. Pravdo
openaire +3 more sources
Piecing together the X-ray background: bolometric corrections for active galactic nuclei [PDF]
, 2007 The X-ray background can be used to constrain the accretion history of supermassive black holes (SMBHs) in active galactic nuclei (AGN), with the SMBH mass density related to the energy density due to accretion.
R. V. Vasudevan, A. C. Fabian
openalex +3 more sources
Ultraviolet and X-ray variability of active galactic nuclei withSwift [PDF]
Monthly Notices of the Royal Astronomical Society, 2016 14 pages, 8 figures, 4 tables in main text, plus 15 pages of figures in appendices.
D. J. K. Buisson +3 more
openaire +5 more sources
The Cosmic Evolution of Hard X-Ray-selected Active Galactic Nuclei [PDF]
, 2005 We use highly spectroscopically complete deep and wide-area Chandra surveys to determine the cosmic evolution of hard X-ray–selected active galactic nuclei (AGNs).
A. J. Barger +6 more
openalex +3 more sources
The Hard X‐Ray Spectrum as a Probe for Black Hole Growth in Radio‐Quiet Active Galactic Nuclei [PDF]
, 2008 We study the hard X-ray spectral properties of 10 highly luminous radio-quiet (RQ) active galactic nuclei (AGNs) at z = 1.3–3.2, including new XMM-Newton observations of four of these sources.
Ohad Shemmer +4 more
openalex +3 more sources
Host galaxy properties of X-ray active galactic nuclei in the local Universe [PDF]
Astronomy & Astrophysics, 2021 We study the host galaxy properties of active galactic nuclei (AGN) that have been detected in X-rays in the nearby Universe ( z < 0 . 2). For that purpose, we use the catalogue provided by the ROSAT-2RXS in the 0.1–2.4keV energy band, one of the largest
L. Koutoulidis +4 more
semanticscholar +1 more source
Comprehensive Broadband X-Ray and Multiwavelength Study of Active Galactic Nuclei in 57 Local Luminous and Ultraluminous Infrared Galaxies Observed with NuSTAR and/or Swift/BAT [PDF]
Astrophysical Journal Supplement Series, 2021 We perform a systematic X-ray spectroscopic analysis of 57 local luminous and ultraluminous infrared galaxy systems (containing 84 individual galaxies) observed with the Nuclear Spectroscopic Telescope Array and/or Swift/BAT.
S. Yamada +6 more
semanticscholar +1 more source